0, 1, 0, 1, 2, 3, 0, 1, 4, 5, 2, 3, 6, 7, 0, 1, 8, 9, 4, 5, 10, 11, 2, 3, 12, 13, 6, 7, 14, 15, 0, 1, 16, 17, 8, 9, 18, 19, 4, 5, 20, 21, 10, 11, 22, 23, 2, 3, 24, 25, 12, 13, 26, 27, 6, 7, 28, 29, 14, 15, 30, 31, 0, 1, 32, 33, 16, 17, 34, 35, 8, 9, 36, 37, 18, 19, 38, 39, 4, 5, 40, 41, 20